Geronimo is a NodeJS Facebook Messenger app that translates audio to text using Google Speech & CloudConvert, and then searches a SQL Server database using the transcribed audio. It also serves as a framework for building more general Messenger apps that interact with attachments & 3rd party services.
Simply clone the repo, run yarn and setup the helpers/constants file. You'll need to create the appropriate GCP/CC apps for being able to access any audio transcription services. Click here and here learn how to do that.
Simply run node index.js or use forever to start the service.
Some familiarity with Facebook's Messenger Platform is assumed. For more information about setting up web hooks, please see here.
With every message a user sends, Facebook will send this app an event containing the PSID (page scoped ID) for the user. The event will also contain any other action the user performed, including text message replies, post-back actions (buttons inside messages & menus) & quick link presses (buttons at the bottom). We process these on the index.js to decide how to proceed for the next message. We can use this PSID to message the user the response after processing.
All images are kept in the /public folder. These are available publicly for the user to view inside messages.
All other code are separated into files inside /helpers. This will review the use of each file that is important to the logic of the app.
Once we receive an event from the user we decide where in the conversation it is. Facebook generally delivers data using their payload property when making calls to our the service. We process this in index.js with some logic statements. Once it is established where their response fits in, we call an action from /helpers/actions.js. The actions file contains the first step in retrieving data from the database, signalling to the user that the bot is typing and sending a reply back to the user using other helper functions. The actions perform the core "action" of responding to the user. Think of it as a controller in an MVC application.
The messenger.js file contains functions for interacting with Facebook's Messenger API. It is used for sending messages back to the user (using their PSID) & setting up bot thread details like the persistent menu.
Ever message back to Facebook needs to be well formatted. When sending a carousel, the message object needs to be structured in a certain manner. All response objects are stored in the responses.js file.
At a very high level the flow goes action & processing -> right response object -> use messenger to send to user
The project was adapted from a MongoDB backbone to a SQL Server one. It also assumes some familiarity of the Facebook Messenger architecture for the setup of the webhooks, apps, etc.